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Keywords: air sac pressure
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Journal Articles
J Exp Biol (2003) 206 (11): 1833–1843.
Published: 01 June 2003
... in the trachea. The cause of abrupt jumps in frequency has not been identified but can be explained on the basis of intrinsic properties of the vocal organ. Air sac pressure variation as a mechanism for frequency modulation contrasts with the specialized syringeal musculature of songbirds and may explain why...